Random Flashcards
Group I afferents (70-120 meters/sec)
Ia: muscle stretch - primary spindle receptors
Ia: limb position and movement - spindle receptors
Ib: tendon tension - golgi tendon organs
Group II or A-beta afferrents (25-70 meters/sec)
II: muscle stretch - secondary spindle receptors
II: limb position and movement - joint and spindle receptor
A-delta: touch - cutaneous receptors
Group III or A-delta afferents (10-30 meters/sec)
III: pressure and pain - deep receptors
A-delta: touch, temp, and pain - cutaneous receptors
Group IV or C afferents (.5-2 meters/sec)
IV: pain deep receptors
C: temp and pain - cutaneous receptors
Pelagic hair receptors
A-beta fibers, quickly adapting, hair bending
Vibrissae receptors
Rapidly adapting and slowly adapting receptors supplies vibrissae (whiskers, sinus hairs, tactile hairs) upper lip or muzzle, chin, above eyes
Pacinian corpuscles
The fastest adapting A beta touch fibers
Located primarily in subQ tissue
Meissner’s corpuscles
Superficial within dermal papillae of glabrous skin
Supplied by A beta class fibers
Fast adapting
Merkel cell
Slowly adapting touch receptor
Located in hairy skin of face, glabrous skin of hand, gingival mucosa
Proprioception
Perception of body positions and movement
Receptors for cold
A delta and C afferent
Receptors for warmth
Only by unmyelinated afferents
Rapidly adapting fibers
Discharges briefly, then stops
Transient events such as stimulus contact and movement or high frequency events like vibration
Slowly adapting fibers
Discharges for the duration of the stimulus
Maintained events like light pressure
The sympathetic preganglionic cell bodies have a
Thoracolumbar origin in intermediate zone
The parasympathetic preganglionic cell bodies have a
Craniosacral origin
Sympathetic postganglionic cell bodies are located in
Chain ganglia or prevertebral ganglia
Parasympathetic postganglionic cell bodies are located in
Specialized parasympathetic ganglia in head or in terminal ganglia near or within visceral organ
Symp preganglionic fibers are usually
Short
Symp postganglionic fibers are usually
Long
Postganglionic fibers are
Unmyelinated (small and slowly conducting)
Preganglionic fibers are
Either thinly myelinated or unmyelinated
